Polyamines of formula (I), their preparation method and their use in an absorbing solution based on amines in order to selectively eliminate H.sub.2S from a gaseous effluent containing H.sub.2S and CO.sub.2, which polyamines are obtained by a reaction between piperazine and an epihalohydrin or a 1,3-dihalo-2-propanol ##STR00001##

Copolymer dispersions containing polyamide segments in aqueous media form binders for coatings for various industrial and construction materials. The copolymers have a high percentage of amide linkages. The copolymers are linked into higher molecular weight species by reactions with polyisocyanates (which forms urea linkages if the other reactant is an amine or a urethane linkage if the other reactant is a hydroxyl group).

The present disclosure relates to a polyimide precursor composition comprising an amic acid ester oligomer of formula (I): ##STR00001## wherein r, R.sub.x, G, P and R are as defined in the specification. Also, a use of the polyimide precursor composition and a polyimide made from the polyimide precursor composition.

Provided are poly(arylamine)s. The polymers can be redox active. The polymers can be used as electrode materials in, for example, electrochemical energy storage systems. The polymers can be made by electropolymerization on a conducting substrate (e.g., a current collector).

The present disclosure relates to a polyimide precursor composition comprising an antic acid ester oligomer of formula (I):

##STR00001## wherein r, R.sub.x, G, P and R are as defined in the specification. Also, a use of the polyimide precursor composition and a polyimide made from the polyimide precursor composition.

To provide a circuit board that has excellent smoothness and capable of reducing a transmission loss of a high-frequency electrical signal.

The circuit board according to the present invention includes a wiring portion and a non-wiring portion, the wiring portion having a metal layer and a resin layer, the non-wiring portion having a resin layer, the resin layer at a frequency 10 GHz having a relative permittivity of from 2 to 3 at 23 C., and the circuit board satisfying a relationship: (AB)/B0.1 wherein A is the maximum value of the thickness in the wiring portion (m) and B is the minimum value of the thickness in the non-wiring portion (m).

The latex polymer compositions of the present invention exhibit latent crosslinking properties. Latent crosslinking in the polymers takes advantage of the fast interaction between the anionic latex charge and the cationic charge associated with polyfunctional amine crosslinkers. Once the latex is coated onto a substrate, the volatile base evaporates and the groups react to form a crosslinked coating with improved wash-off properties.

The invention concerns novel polyamines having formula (I) obtained from the reaction between a polyol diglycidylether and piperazine: ##STR00001##
in which n is a whole number between 0 and 30, R.sub.1 has different forms, R.sub.2 has formula (g.sub.5), and R.sub.2 has formula (g.sub.6) when n=0 ##STR00002## R.sub.6: H, C1-C6 alkyl or hydroxyalkyl radical, R.sub.7: C1-C6 alkyl or hydroxyalkyl radical, R.sub.6 and R.sub.7 may be connected together to form a heterocycle having 5, 6, 7 or 8 atoms when R.sub.6 is other than H, R.sub.8: H, C1-C4 alkyl or hydroxyalkyl radical. The invention also concerns their preparation method and their use in an absorbing solution based on amines in order to selectively eliminate H.sub.2S from a gaseous effluent containing H.sub.2S and CO.sub.2.

Embodiments of the present disclosure describe carbocyclic pseudo Trger's base (CTB) amines. Embodiments of the present disclosure further describe microporous polymers derived from pseudo CTB amines, including, but not limited to, polyimides, CTB ladder polymers, and network porous polymers. Other embodiments describe a method of separating chemical species in a fluid composition comprising contacting a microporous polymer membrane with a fluid composition including at least two chemical species, wherein the microporous polymer membrane includes one or more of a ladder polymer of intrinsic microporosity, a microporous polyimide, and a microporous network polymer; and capturing at least one of the chemical species from the fluid composition.

Semicrystalline polyamide comprising at least one monomer resulting from the condensation of a diacid and a diamine of formula AP.Y, said semicrystalline polyamide having the following general formula (I):

AP.Y/(A).sub.m/(Pip.Y).sub.n/(B.Y).sub.q (1)

and said semicrystalline polyamide having a Tm.sub.1 less than or equal to about 150 C., notably less than or equal to about 130 C., in particular less than or equal to about 120 C. and/or a Tg less than or equal to about 60 C., in particular less than Or equal to about 50 C., notably less than or equal to about 40 C., as determined by DSC according to standard ISO 11357-3 (2013) and ISO 11357-2 (2013), respectively.